The European Space Agency (ESA) had calculated that an iceberg the size of Greater London was likely to break off. "Almost two years later, the berg is desperately clinging on, although current data indicate calving is imminent," ESA said in a statement last week. "A new crack, spotted in images captured by the Copernicus Sentinel missions, now suggests the potential for calving of multiple bergs."
Satellite views of the area show quite a bit of activity, and some of the larger features even have names. The "Halloween crack" was first spotted on Oct. 31, 2016. "Chasm 1" is a massive crack with a history spanning over 25 years. The new, unnamed crack is what's getting a lot of attention now. It's marked in red and has had a rapid expansion.
NASA is also watching the cracks grow along the ice shelf and wondering if it will spawn an iceberg before the summer season ends. "The breaking, or 'calving,' of icebergs from ice shelves is part of a natural, cyclical process of growth and decay at the limits of Earth's ice sheets," said NASA's Earth Observatory in January.